Bulletin of the American Physical Society
APS April Meeting 2024
Wednesday–Saturday, April 3–6, 2024; Sacramento & Virtual
Session T08: Accelerator Technologies
3:45 PM–5:09 PM,
Saturday, April 6, 2024
SAFE Credit Union Convention Center
Room: Ballroom A10-11, Floor 2
Sponsoring
Unit:
DPB
Chair: Manel Errando, Washington University in Saint Louis
Abstract: T08.00006 : Resonant Faraday rotation measurements in a potassium vapor cell*
4:45 PM–4:57 PM
Presenter:
Jiachen He
(University of Kentucky)
Authors:
Jiachen He
(University of Kentucky)
Wolfgang K Korsch
(University of Kentucky)
For this study, a tunable diode laser operating at a wavelength near the potassium D2 line (766.7 nm) is employed. A potassium vapor cell is positioned inside a uniform magnetic field (approximately 5-10 G) generated by a pair of Helmholtz coils. Using PEM ellipsometry, a basic polarizer-analyzer optics setup, and modulation techniques, we extract changes in polarization as the laser beam interacts with Zeeman-shifted potassium atoms—typically measured less than 100 millidegrees. A temperature stabilization of the potassium vapor cell within 0.1°C keeps the vapor density stable enough to measure the Faraday rotation angle and therefore the magnitude of the external field with high precision.
The primary objective of this study is to explore the potential application of the resonant Faraday effect in probing the polarization dynamics of helium-3 within hybrid Spin Exchange Optical Pumping (SEOP) cells. Progress on the status of the experiment will be presented.
*This research is funded by the DOE grant: DE-FG02-99ER41101.
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